heater core started to leak in late may and started to take it apart first week of june. i got stuck at removing the dash support and big black box thing. i took a vacation for a month and once back i ordered the parts.
since i had to evacuate the a/c to get the black box out i also replaced the a/c evaporator, expansion valve, and dryer.
a tip; i dropped the steering colum but not far down enough and the dash support was getting stuck on the key cylinder area. so drop the colum down as far as you can.
after putting the a/c evap, expansion valve and heater core and completely installed in the car, i put the blend door things(near driver knees; if that is what it is called) on wrong. then as i put the dash on and bolted down i found i forgot to put the air vent ducks! so out came the dash again.
i got Harbor freight A/c gauges and 2.5 vacuum pump and it worked great. make sure you clean the fittings a bit before tightening to the fittings.
it held vacuum for about almost 2 hours and vacuum for about 3 hours. i got some pag100 oil and 2 short cans of refrigerant. forgot to get the cap dispenser, so had to go back and get that.
once charged a/c was nice and cold and no leaks.